Here is the full list of all 29 AereA trophies - there are 15 bronze, 6 silver, 7 gold and 1 platinum.
Use a skill 100 times or more
Hold 25.000 Clefines in your inventory
Collect all shop books
Retrieve the Baton
Reach level 50 with any class
Retrieve the Drum
Retrieve the Violin
Retrieve the Bell
Complete all sidequests
Hold 10.000 Clefines in your inventory
Reach level 30 with any class
Freeze an enemy
Burn an enemy
Retrieve the Sousaphone
Poison an enemy
Retrieve the Accordion
Retrieve the Harp
Complete 50% of all sidequests
Hold 5.000 Clefines in your inventory
Retrieve the Lyre
Reach level 10 with any class
Retrieve the Bagpipes
Complete the prologue
Revive a party member
Complete a sidequest
Play with 2-4 players
You are the true Grand Meastro
Buy all skills from all classes
Upgrade all skills from all classes to level 3